The car has been running on the standard radiator and thermostat since day 1, and it is amazing that it actually lasted until today without any heat problems.
Only as of recent, we noticed there were some bubbling and we decided that it is time to upgrade the cooling system of the car once and for all.
Forged Racing aluminium radiator, Mishimoto racing low temperature 68 degree thermostat and a TRD 1.3 bar radiator cap sums it all.
Both the radiator and thermostat comes with lifetime manufacturer warranty, no complaints there and the engine is purring like a kitten now.